A short proof of a theorem of Juhasz

作者：Spadaro Santi^*

来源：Topology and Its Applications, 2011, 158(16): 2091-2093.

DOI：10.1016/j.topol.2011.06.002

• Arhangel'skii Theorem
• Increasing union
• Free sequence
• Elementary submodel

We give a simple proof of the increasing strengthening of Arhangel'skii Theorem. Our proof naturally leads to a refinement of this result of Juhasz.

• 出版日期2011-10-1